rjdaugh(at)rapidnet.com
Guest
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 Posted: Tue Jan 10, 2006 6:49 pm Post subject: 912S Gremlin, Advice needed and a lesson learned. a follow u |
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For all you 91X drivers out there. I urge you to revisit the SB having to
do with Evans waterless coolant.
http://www.rotax-owner.com/si tb info/serviceb/SB912043914029.pdf
After pulling things apart and checking everything I can think of, I have
not found a problem, nor have I been able to make my engine boil over again.
But the service bulletin makes it sound like it is something that can just
happen without your head temperatures getting to the maximum permissible
temperatures. I think that it has something to do with the four parallel
paths that the coolant takes to the heads. I think once one head gets a
steam bubble, the coolant happily goes to the other heads and lets the one
overheating head blow a lot of your coolant out of the engine. (See my
original description below.) The Evans coolant won't do that. I think that
this is why Rotax says to change to Evans propylene glycol based coolant.
I can not rule out the air bubble that Cliff Begnaud and John McBean
identified, but since I had been flying for over a year I think that this is
an unlikely explanation. I am switching to Evans permanent coolant. !
And I urge everyone else to follow the Rotax service bulletin and do the
same.
Randy - 912S series 5/7
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